Tubing, aluminum alloy, 6061-t6, spec qq-a-250/11; 4.54 in. Outside dia; 4.23 in. Inside dia; 0.20 in. Thick; weld must melt through material and be furnished within dimensions and tolerances of part; inside dia. 4.23 in. Is 0.03 in. Thick which expands to 4.42 in. Inside dia; ring pressure f/mine at he m75